Been using B2Evolution for a number of years - gone through a number of updates - and today, for the first time in a while I added a new collection and was going through aligning the settings with my other collections. When I came to edit the widgets I got the error message "This action can only be performed with HTTP_REFERER = http://www.boscombebandsa.org.uk/" (although some of the changes that I wanted to happen still took place, which was confusing in itself). I am guessing that in one of the many updates something has changed that I have not kept up with due to the fact that having set things up I didn't need to change any of the widget settings.
In those cases where I have succeeded in making changes, the error message was coming up and I simply ignored it - so I have made many of the changes that I wanted to, so perhaps the error is just annoying rather than actually stopping me doing something!
I am using 6.9.6 stable and the url of one of my collections is www.boscombebandsa.org.uk/repertoire.php
many thanks in advance for any help